Nitrification liquid backflow device

Abstract

The utility model discloses a nitrification liquid backflow device which comprises a facultative tank and an aerobic tank, a water inlet is formed in the top of the facultative tank, and a water outlet is formed in one side of the aerobic tank; the nitrification liquid pipe comprises an input end and an output end, the input end of the nitrification liquid pipe is communicated with the water outlet of the aerobic tank, and a reflux pump is arranged on one side of the input end of the nitrification liquid pipe; the output end of the nitrification liquid pipe is arranged at the top of the water inlet of the facultative tank and is not in contact with the water surface of the facultative tank; one end, close to the aerobic tank, of the top pipe section of the nitrification liquid pipe is higher than one end of the facultative tank; the pipe diameter of the output end of the nitrification liquid pipe is larger than that of the nitrification liquid pipe; and a buffer device is arranged at the bottom of the output end of the nitrification liquid pipe. The device ensures that water in the facultative tank does not flow back into the nitrification liquid pipe and the reflux pump when the reflux pump valve is overhauled, so that the nitrification liquid pipe or the reflux pump valve is overhauled conveniently, a large amount of oxygen is prevented from being brought into the water in the facultative tank, and the nitrification liquid reflux operation environment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of biological denitrification, in particular to a nitrification liquid reflux device. Background Art

[0002] In the biological denitrification system of the AO tank (A is the facultative aerobic tank, O is the aerobic tank), in order to remove the total nitrogen in the sewage, the mud-water mixture at the end of the aerobic tank, i.e. the nitrification liquid, must be pumped back to the facultative aerobic tank. The denitrifying bacteria and low dissolved oxygen environment in the facultative aerobic tank are used to convert the nitrate nitrogen and nitrite nitrogen produced in the aerobic tank into nitrogen gas, thereby achieving the removal of total nitrogen in the sewage.

[0003] In the related art, when the nitrification liquid flows back from the aerobic tank through the nitrification liquid pipe to the facultative aeration tank, in order to reduce the impact of the water flow, avoid the impact of the water flow stirring to bring in more oxygen and the splashing and foaming caused by the water flow impacting the water surface, the output port of the nitrification liquid pipe is generally a semi-submerged design, that is, the output port of the nitrification liquid pipe is half below the water surface of the facultative aerobic tank and half above the water surface; however, when the nitrification liquid pipe is perforated and leaks, the reflux pump needs to be shut down for maintenance, or when the reflux pump outlet valve is abnormal and cannot be closed or is not closed tightly, a large amount of water in the facultative aerobic tank will flow back into the nitrification liquid pipe and the reflux pump, eventually making maintenance difficult or even impossible. It is difficult to prevent the water in the facultative aerobic tank from flowing back by blocking the output end of the nitrification liquid pipe with a mud bag, and it may also cause mud and sand to enter the nitrification liquid pipe and the reflux pump, affecting the normal operation of the nitrification liquid reflux system and increasing the difficulty of maintenance of the nitrification liquid pipe and the reflux pump.

[0004] Therefore, a new nitrification liquid reflux device is urgently needed to solve the problem that when the reflux pump, the reflux pump outlet valve and the nitrification liquid pipe are overhauled, the water in the aeration tank flows back, causing maintenance difficulties, and at the same time avoid the impact stirring of the nitrification liquid flow bringing in a large amount of oxygen, affecting the hypoxic environment of the aerobic tank (the dissolved oxygen content in the aerobic tank water is required to be less than 0.5 mg / L) and the splashing and foaming caused by the water flow impacting the water surface. Utility Model Content

[0005] The purpose of the present invention is to provide a nitrating liquid reflux device to solve at least one aspect of the problems and defects raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A nitrifying liquid reflux device, comprising:

[0008] An aerobic pool and an aerobic pool, wherein the aerobic pool is provided with a water inlet on the top and a water outlet on one side of the aerobic pool;

[0009] A nitrification liquid pipe comprises an input end and an output end, wherein the input end of the nitrification liquid pipe is connected to the water outlet of the aerobic tank, and a reflux pump is provided on one side of the input end of the nitrification liquid pipe;

[0010] The output end of the nitrification liquid pipe is arranged at the top of the water inlet of the anoxic pool and does not contact the water surface of the anoxic pool;

[0011] The top pipe section of the nitrification liquid pipe is tilted, and the end of the top pipe section of the nitrification liquid pipe close to the aerobic tank is higher than the end of the aerobic tank;

[0012] The diameter of the output end of the nitrification liquid pipe is larger than the diameter of the nitrification liquid pipe, and a buffer device is provided at the bottom of the output end of the nitrification liquid pipe.

[0013] The nitrifying liquid reflux device according to this solution has at least the following technical effects:

[0014] The nitrification liquid reflux device arranges the output end of the nitrification liquid pipe at the top of the water inlet of the anoxic pool without contacting the water surface of the anoxic pool. Compared with the semi-submerged arrangement of the output end of the traditional nitrification liquid pipe, it can effectively prevent the water in the anoxic pool from flowing back to the reflux pump when the reflux pump valve is not tightly closed or needs to be replaced, thereby avoiding the reflux pump valve being unable to be repaired or difficult to repair. It can also avoid the risk of mud and sand entering the nitrification liquid pipe by blocking the output end of the nitrification liquid pipe with a mud bag. The device ensures that when the reflux pump valve is being repaired, the water in the anoxic pool will not flow back into the nitrification liquid pipe and the reflux pump, thereby improving the convenience and efficiency of the repair of the reflux pump valve.

[0015] At the same time, the top section of the nitrification liquid pipe, close to the aerobic tank, is higher than the end of the aerobic tank. When the reflux pump is shut down for maintenance of the nitrification liquid pipe or the reflux pump valve, the nitrification liquid can flow back to the aerobic tank through the inclination angle of the top section of the nitrification liquid pipe, effectively draining the nitrification liquid and accumulated mud in the nitrification liquid pipe, making maintenance easier and improving operational convenience.

[0016] In addition, the diameter of the output end of the nitrification liquid pipe is larger than the diameter of the nitrification liquid pipe, and a buffer device is provided at the bottom of the output end of the nitrification liquid pipe, which can effectively expand the diameter of the output end of the nitrification liquid pipe, greatly slowing down the impact disturbance caused by the water flow at the output end of the nitrification liquid pipe on the water in the aeration tank, avoiding splashing, foaming and other problems caused by the water flow impacting the water surface of the aeration tank, improving the nitrification liquid reflux operation environment, and at the same time avoiding bringing a large amount of oxygen into the aeration tank, affecting the low oxygen environment of the aeration tank.

[0017] As a further solution of the present invention: the inclination angle of the top section of the nitrification liquid pipe from one end of the facultative aerobic tank to one end of the aerobic tank is 1°-10°.

[0018] Since the inclination angle of the top section of the nitrification liquid pipe from one end of the syngas tank to the other end of the aerobic tank is 1°-10°, when the nitrification liquid pipe or the reflux pump valve needs to be inspected and maintained, the nitrification liquid can flow from one end of the syngas tank to the other end of the aerobic tank through the inclination angle of 1°-10° to overcome the effect of gravity and achieve self-flow, thereby preventing the top section of the nitrification liquid pipe from retaining liquid and mud, and ensuring the convenience and efficiency of the inspection and maintenance of the nitrification liquid pipe or the reflux pump valve.

[0019] As a further solution of the present invention: the output end of the nitrification liquid pipe is configured to be in a trumpet shape with a small top and a large bottom.

[0020] Since the output end of the nitrification liquid pipe is configured in a trumpet-shaped manner with a small top and a large bottom, the water flow velocity can be effectively reduced when the nitrification liquid flows to the trumpet-shaped output end of the nitrification liquid pipe, thereby preventing the water flow from causing impact disturbance to the water in the aeration tank and bringing in a large amount of oxygen.

[0021] As a further solution of the present invention: the top of the buffer device is communicated with the bottom of the output end of the nitrifying liquid pipe, and the bottom of the buffer device is open.

[0022] As a further solution of the present invention: the opening area of ​​the bottom of the buffer device is 2 to 5 times larger than the opening area of ​​the output end of the nitrification liquid tube.

[0023] Since the top of the buffer device is connected to the bottom of the output end of the nitrification liquid pipe, the bottom of the buffer device is open, and the opening area of ​​the bottom of the buffer device is 2 to 5 times larger than the opening area of ​​the output end of the nitrification liquid pipe, the buffer device can expand the water flow outlet of the nitrification liquid pipe, further reduce the water flow velocity of the nitrification liquid, and prevent the water flow from causing impact disturbance to the water in the aerobic tank and bringing in a large amount of oxygen.

[0024] As a further solution of the present invention: the buffer device is provided with a plurality of partitions along the width of both sides of the inner wall, and the spacing between the plurality of partitions increases successively from the middle to both ends of the buffer device.

[0025] By arranging a plurality of partitions along the width of both sides of the inner wall of the buffer device, and the spacing between the plurality of partitions increases successively from the middle to the two ends of the buffer device, it is possible to effectively prevent the nitrifying liquid from concentrating and flowing out of the middle part of the buffer device. The spacing of the partitions can be used to guide the nitrifying liquid into the water flow channel between the other partitions of the buffer device, thereby preventing the nitrifying liquid from concentrating and causing the flow velocity to be too high, and further reducing the impact of the nitrifying liquid on the water in the aeration tank.

[0026] As a further solution of the present invention: the top section of the nitrification liquid pipe is provided with an exhaust pipe, and the exhaust pipe is provided with an exhaust valve.

[0027] By arranging an exhaust pipe at the highest point of the top section of the nitrification liquid pipe, and providing an exhaust valve on the exhaust pipe, the gas gathered at the highest point of the top section of the nitrification liquid pipe can be promptly removed, thereby effectively slowing down the occurrence of cavitation, reducing damage to the nitrification liquid pipe, ensuring smooth flow of the nitrification liquid, and improving the flow stability of the nitrification liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0029] Figure 1 This is a structural diagram of a nitrification liquid reflux device;

[0030] Figure 2 It is a partial structural diagram of a nitrification liquid reflux device;

[0031] Figure 3 for Figure 2 AA surface cross-sectional structure diagram.

[0032] Reference numerals:

[0033] 1. Facultative oxygen tank; 101. Water inlet; 2. Aerobic tank; 201. Water outlet; 3. Nitration liquid pipe; 301. Input end; 302. Output end; 303. Reflux pump; 4. Buffer device; 401. Partition; 5. Exhaust pipe; 6. Exhaust valve. DETAILED DESCRIPTION

[0034] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0035] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0036] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0037] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for the purpose of explaining the present invention and are not intended to limit the present invention. That is, the embodiments described herein are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein can be arranged and designed in a variety of different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0040] like Figure 1-3 The embodiment of the utility model shown is a nitrification liquid reflux device, comprising: an aerobic tank 1 and an aerobic tank 2, wherein the aerobic tank 1 is provided with a water inlet 101 at the top, and the aerobic tank 2 is provided with a water outlet 201 on one side; a nitrification liquid pipe 3, comprising an input end 301 and an output end 302, the input end 301 of the nitrification liquid pipe 3 being connected to the water outlet 201 of the aerobic tank 2, and a reflux pump 303 being provided on one side of the input end 301 of the nitrification liquid pipe 3; the output end 302 of the nitrification liquid pipe 3 is provided at the top of the water inlet 101 of the aerobic tank 1 and does not contact the water surface of the aerobic tank 1; the top section of the nitrification liquid pipe 3 is arranged obliquely, and the end of the top section of the nitrification liquid pipe 3 close to the aerobic tank 1 is higher than the end of the aerobic tank 2; the diameter of the output end 302 of the nitrification liquid pipe 3 is larger than the diameter of the nitrification liquid pipe 3, and a buffer device 4 is provided at the bottom of the output end 302 of the nitrification liquid pipe 3.

[0041] Specifically, the nitrification liquid reflux device is configured so that the output end 302 of the nitrification liquid pipe 3 is located at the top of the water inlet 101 of the anoxic pool 1 and does not contact the water surface of the anoxic pool 1. Compared with the semi-submerged configuration of the output end of the traditional nitrification liquid pipe, the device can effectively prevent the water in the anoxic pool 1 from flowing back to the reflux pump 303 when the valve of the reflux pump 303 is not tightly closed or needs to be replaced, thereby avoiding the reflux pump 303 valve from being unable to be repaired or difficult to repair. In addition, the device can avoid the risk of mud and sand entering the nitrification liquid pipe 3 by blocking the output end 302 of the nitrification liquid pipe 3 with a mud bag. The device ensures that when the valve of the reflux pump 303 is being repaired, the water in the anoxic pool 1 will not flow back into the nitrification liquid pipe 3 and the reflux pump 303, thereby improving the convenience and efficiency of the repair of the valve of the reflux pump 303.

[0042] At the same time, the end of the top section of the nitrification liquid pipe 3 close to the aerobic tank 1 is higher than the end of the aerobic tank 2. When the reflux pump 303 is stopped to overhaul the nitrification liquid pipe 2 or the valve of the reflux pump 303, the nitrification liquid passes through the inclination angle of the top section of the nitrification liquid pipe 3, so that the nitrification liquid can flow back into the aerobic tank 2, effectively emptying the nitrification liquid and accumulated mud in the nitrification liquid pipe 3, making it easier to overhaul and improving operational convenience.

[0043] In addition, the diameter of the output end 302 of the nitrification liquid pipe 3 is larger than the diameter of the nitrification liquid pipe 3, and a buffer device 4 is provided at the bottom of the output end 302 of the nitrification liquid pipe 3, which can effectively expand the diameter of the output end 302 of the nitrification liquid pipe 3, greatly slow down the impact disturbance caused by the water flow of the output end 302 of the nitrification liquid pipe 3 on the water in the aerobic tank 1, avoid splashing, foaming and other problems caused by the water flow impacting the water surface of the aerobic tank 1, improve the nitrification liquid reflux operation environment, and at the same time avoid bringing a large amount of oxygen into the aerobic tank, affecting the low oxygen environment of the aerobic tank.

[0044] Furthermore, the inclination angle of the top section of the nitrification liquid pipe 3 from one end of the facultative aerobic tank 1 to one end of the aerobic tank 2 is 1°-10°.

[0045] Specifically, since the inclination angle of the top section of the nitrification liquid pipe 3 from one end of the facultative aerobic tank 1 to one end of the aerobic tank 2 is 1°-10°, when the nitrification liquid pipe 3 or the valve of the reflux pump 303 needs to be inspected and maintained, the nitrification liquid can flow from one end of the top section of the nitrification liquid pipe 3 in the facultative aerobic tank 1 to one end of the aerobic tank 2 by overcoming the effect of gravity at the inclination angle of 1°-10°, thereby achieving self-flow, thereby preventing the top section of the nitrification liquid pipe 3 from retaining liquid and sludge, and ensuring the convenience and efficiency of the inspection and maintenance of the nitrification liquid pipe 3 or the valve of the reflux pump 303.

[0046] like Figure 1 As shown, the output end 302 of the nitrification liquid pipe 3 is configured to be in a trumpet shape with a small top and a large bottom.

[0047] Specifically, since the output end 302 of the nitrification liquid pipe 3 is configured to be trumpet-shaped with a small top and a large bottom, when the nitrification liquid flows to the trumpet-shaped output end 302 of the nitrification liquid pipe 3, the water flow velocity can be effectively reduced, thereby preventing the water flow from causing impact disturbance to the water in the aerobic tank 1 and bringing in a large amount of oxygen.

[0048] Furthermore, the top of the buffer device 4 is connected to the bottom of the output end 302 of the nitrification liquid pipe 3, and the bottom of the buffer device 4 is open; the opening area of ​​the bottom of the buffer device 4 is 2 to 5 times larger than the opening area of ​​the output end 302 of the nitrification liquid pipe 3.

[0049] Specifically, since the top of the buffer device 4 is connected to the bottom of the output end 302 of the nitrification liquid pipe 3, the bottom of the buffer device 4 is open, and the opening area of ​​the bottom of the buffer device 4 is 2 to 5 times larger than the opening area of ​​the output end 302 of the nitrification liquid pipe 3, the buffer device 4 can expand the water flow outlet of the nitrification liquid pipe 3, further reduce the water flow velocity of the nitrification liquid, and prevent the water flow from causing impact disturbance to the water in the aerobic tank 1 and bringing in a large amount of oxygen.

[0050] Furthermore, if Figure 3 As shown, the buffer device 4 is provided with a plurality of partitions 401 along the width of both sides of the inner wall, and the spacing between the plurality of partitions 401 increases sequentially from the middle to the two ends of the buffer device 4 .

[0051] Specifically, by arranging a plurality of partitions 401 along the width of both sides of the inner wall of the buffer device 4, the spacing between the plurality of partitions 401 increases successively from the middle to the two ends of the buffer device 4, thereby effectively preventing the nitrifying liquid from concentrating and flowing out of the middle part of the buffer device 4. By arranging the spacing of the partitions 401, the nitrifying liquid can be guided into the water flow channel between the other partitions 401 of the buffer device 4, thereby preventing the nitrifying liquid from concentrating and causing the flow velocity to be too high, thereby further reducing the impact of the nitrifying liquid on the water in the aeration tank 1.

[0052] like Figure 2 As shown, an exhaust pipe 5 is provided at the highest point of the top section of the nitrification liquid pipe 3 , and an exhaust valve 6 is provided on the exhaust pipe 5 .

[0053] Specifically, by arranging an exhaust pipe 5 at the highest point of the top section of the nitrifying liquid pipe 3, and providing an exhaust valve 6 on the exhaust pipe 5, the gas accumulated at the highest point of the top section of the nitrifying liquid pipe 3 can be promptly removed, thereby effectively slowing down the occurrence of cavitation, reducing damage to the nitrifying liquid pipe 3, ensuring smooth flow of the nitrifying liquid, and improving the flow stability of the nitrifying liquid.

[0054] The above content is merely an example and explanation of the structure of the present utility model. Technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the scope of protection of the present utility model.

Claims

1. A nitrification liquid reflux device, characterized in that: include: An aerobic tank (1) and an aerobic tank (2), wherein the aerobic tank (1) is provided with a water inlet (101) at the top, and the aerobic tank (2) is provided with a water outlet (201) at one side; The nitrification liquid pipe (3) comprises an input end (301) and an output end (302), wherein the input end (301) of the nitrification liquid pipe (3) is connected to the water outlet (201) of the aerobic tank (2), and a reflux pump (303) is provided on one side of the input end (301) of the nitrification liquid pipe (3); The output end (302) of the nitrification liquid pipe (3) is arranged at the top of the water inlet (101) of the anoxic pool (1) and does not contact the water surface of the anoxic pool (1); The top pipe section of the nitrification liquid pipe (3) is arranged at an angle, and one end of the top pipe section of the nitrification liquid pipe (3) close to the facultative aerobic tank (1) is higher than one end of the aerobic tank (2); The diameter of the output end (302) of the nitrifying liquid pipe (3) is larger than the diameter of the nitrifying liquid pipe (3), and a buffer device (4) is provided at the bottom of the output end (302) of the nitrifying liquid pipe (3).

2. The nitrifying liquid reflux device according to claim 1, characterized in that: The inclination angle of the top pipe section of the nitrification liquid pipe (3) from one end of the facultative aerobic tank (1) to one end of the aerobic tank (2) is 1°-10°.

3. The nitrifying liquid reflux device according to claim 1, characterized in that: The output end (302) of the nitrification liquid pipe (3) is configured in a trumpet-shaped manner with a small top and a large bottom.

4. The nitrifying liquid reflux device according to claim 3, characterized in that: The top of the buffer device (4) is in communication with the bottom of the output end (302) of the nitrification liquid pipe (3), and the bottom of the buffer device (4) is open.

5. The nitrifying liquid reflux device according to claim 4, characterized in that: The opening area at the bottom of the buffer device (4) is 2 to 5 times larger than the opening area of ​​the output end (302) of the nitrification liquid pipe (3).

6. The nitrifying liquid reflux device according to claim 5, characterized in that: The buffer device (4) is provided with a plurality of partitions (401) along the width of both sides of the inner wall, and the spacing between the plurality of partitions (401) increases sequentially from the middle to both ends of the buffer device (4).

7. The nitrating liquid reflux device according to any one of claims 1 to 6, characterized in that: An exhaust pipe (5) is provided at the highest point of the top pipe section of the nitrification liquid pipe (3), and an exhaust valve (6) is provided on the exhaust pipe (5).

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